Americans should not be too surprised by this latest wave of domestic plots. After all, domestic attacks make up the vast majority of terrorist activity–jihadist or not. Neither should they be too surprised about homegrown AQ-inspired activity, which is simply part of the current wave of terrorist activity around the world, as Karen Rasler and William Thompson tell us. Some scholars have even argued that Al Qaeda-inspired terrorism is simply a “fad” that will eventually go the way of all other other fads.

Nonetheless, this brings up three important questions: (1) Will the current wave of jihadist terrorism be replaced? (2) If so, by what kind of terrorism? (3) Where?

One of the most important continuities during the past forty years is the fact that terrorism tends to occur much more in democratic countries than in nondemocratic ones–the subject of the book I am currently completing for Columbia University Press. Take a look at this chart, which shows the the number of terrorist attacks between 1970 and 2008 according to the Global Terrorism Database, distributed by regime type:

But here’s the good news: terrorism is incredibly rare, even in democracies. As John Mueller insists, a person is more likely to drown in one’s toilet than to be killed (or hurt) by a terrorist. Although there is a fascination with terrorism among the public and in the media, and although it is certainly destructive, violent, and terrifying to those who experience it, terrorist attacks almost never occur.

Moreover, in a recent working paper with Joe Young, he and I find that terrorism does not actually threaten “our way of life,” as some argue. Democracies are incredibly resilient to terrorist threats, and although democracies occasionally do circumvent limits on civil liberties, such measures are usually temporary and are typically repealed over time. Martha Crenshaw has found that democracies almost never retaliate against foreign terrorist attacks using military force, although when they do, it can be quite consequential as we’ve seen in Afghanistan.

My point is that terrorist plots and terrorist attacks are rare but normal in democracies–and that’s likely to continue. Although terrorism is a nuisance, it is not an existential threat to the United States, nor is it ever likely to be.

On the whole, there is nothing to fear but fear itself.

The Department of Homeland Security should put that on a billboard.

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[1] I shan’t dabble in definitions of terrorism because the caveats and qualifications could go on ad nauseam. For those interested in debates on how terrorism should be defined, Chapter 1 of Bruce Hoffman’s Inside Terrorism is great on the subject. I use a fairly noncontroversial definition: terrorism is politically-motivated violence by non-state actors directed at civilians to produce fear in a broader population.